/**
 * 
 */
package info.niwota.dc;

import android.content.Context;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.FrameLayout;
import android.util.Log;

/**
 * A bounded time picker based on time picker
 * 
 * @author qiangli
 * 
 */
public class HourMinutePicker extends FrameLayout {

	private static final String TAG = "HourMinutePicker";

	/**
	 * A no-op callback used in the constructor to avoid null checks later in
	 * the code.
	 */
	private static final OnTimeChangedListener NO_OP_CHANGE_LISTENER = new OnTimeChangedListener() {
		public void onTimeChanged(HourMinutePicker view, int hourOfDay,
				int minute) {
		}
	};

	// state
	private int mCurrentHour = 0; // 0-23
	private int mCurrentMinute = 0; // 0-59

	// ui components
	private final NumberPicker mHourPicker;
	private final NumberPicker mMinutePicker;

	// private final Button mAmPmButton;
	// private final String mAmText;
	// private final String mPmText;

	// callbacks
	private OnTimeChangedListener mOnTimeChangedListener;

	/**
	 * The callback interface used to indicate the time has been adjusted.
	 */
	public interface OnTimeChangedListener {

		/**
		 * @param view
		 *            The view associated with this listener.
		 * @param hourOfDay
		 *            The current hour.
		 * @param minute
		 *            The current minute.
		 */
		void onTimeChanged(HourMinutePicker view, int hourOfDay, int minute);
	}

	public HourMinutePicker(Context context) {
		this(context, null);
	}

	public HourMinutePicker(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public HourMinutePicker(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		if (Debug.DEBUG) {
			Log.d(TAG, "HourMinutePicker context: " + context + " attrs: "
					+ attrs + " defStyle: " + defStyle);
		}
		LayoutInflater inflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		inflater.inflate(R.layout.hour_minute_picker, this, // we are the parent
				true);

		// hour
		mHourPicker = (NumberPicker) findViewById(R.id.hour);
		mHourPicker.setFormatter(NumberPicker.TWO_DIGIT_FORMATTER);
		mHourPicker.setOnChangeListener(new NumberPicker.OnChangedListener() {
			public void onChanged(NumberPicker spinner, int oldVal, int newVal) {
				mCurrentHour = newVal;
				onTimeChanged();
			}
		});

		// digits of minute
		mMinutePicker = (NumberPicker) findViewById(R.id.minute);
		mMinutePicker.setSpeed(100);
		mMinutePicker.setFormatter(NumberPicker.TWO_DIGIT_FORMATTER);
		mMinutePicker.setOnChangeListener(new NumberPicker.OnChangedListener() {
			public void onChanged(NumberPicker spinner, int oldVal, int newVal) {
				mCurrentMinute = newVal;
				onTimeChanged();
			}
		});

		//
		configurePickerRanges();

		// initialize to current time

		setOnTimeChangedListener(NO_OP_CHANGE_LISTENER);

		// by default we're not in 24 hour mode
		// Calendar cal = Calendar.getInstance();
		// setCurrentHour(cal.get(Calendar.HOUR_OF_DAY));
		// setCurrentMinute(cal.get(Calendar.MINUTE));
		//
		setCurrentHour(0);
		setCurrentMinute(0);

		if (!isEnabled()) {
			setEnabled(false);
		}
	}

	@Override
	public void setEnabled(boolean enabled) {
		super.setEnabled(enabled);
		mMinutePicker.setEnabled(enabled);
		mHourPicker.setEnabled(enabled);
	}

	/**
	 * Used to save / restore state of time picker
	 */
	private static class SavedState extends BaseSavedState {

		private final int mHour;
		private final int mMinute;

		private SavedState(Parcelable superState, int hour, int minute) {
			super(superState);
			mHour = hour;
			mMinute = minute;
		}

		private SavedState(Parcel in) {
			super(in);
			mHour = in.readInt();
			mMinute = in.readInt();
		}

		public int getHour() {
			return mHour;
		}

		public int getMinute() {
			return mMinute;
		}

		@Override
		public void writeToParcel(Parcel dest, int flags) {
			super.writeToParcel(dest, flags);
			dest.writeInt(mHour);
			dest.writeInt(mMinute);
		}

		@SuppressWarnings("unused")
		public static final Parcelable.Creator<SavedState> CREATOR = new Creator<SavedState>() {
			public SavedState createFromParcel(Parcel in) {
				return new SavedState(in);
			}

			public SavedState[] newArray(int size) {
				return new SavedState[size];
			}
		};
	}

	@Override
	protected Parcelable onSaveInstanceState() {
		Parcelable superState = super.onSaveInstanceState();
		return new SavedState(superState, mCurrentHour, mCurrentMinute);
	}

	@Override
	protected void onRestoreInstanceState(Parcelable state) {
		SavedState ss = (SavedState) state;
		super.onRestoreInstanceState(ss.getSuperState());
		setCurrentHour(ss.getHour());
		setCurrentMinute(ss.getMinute());
	}

	/**
	 * Set the callback that indicates the time has been adjusted by the user.
	 * 
	 * @param onTimeChangedListener
	 *            the callback, should not be null.
	 */
	public void setOnTimeChangedListener(
			OnTimeChangedListener onTimeChangedListener) {
		mOnTimeChangedListener = onTimeChangedListener;
	}

	/**
	 * @return The current hour (0-23).
	 */
	public Integer getCurrentHour() {
		return mCurrentHour;
	}

	/**
	 * Set the current hour.
	 */
	public void setCurrentHour(Integer currentHour) {
		this.mCurrentHour = currentHour;
		updateHourDisplay();
	}

	/**
	 * @return The current minute.
	 */
	public Integer getCurrentMinute() {
		return mCurrentMinute;
	}

	/**
	 * Set the current minute (0-59).
	 */
	public void setCurrentMinute(Integer currentMinute) {
		this.mCurrentMinute = currentMinute;
		updateMinuteDisplay();
	}

	@Override
	public int getBaseline() {
		return mHourPicker.getBaseline();
	}

	/**
	 * Set the state of the spinners appropriate to the current hour.
	 */
	private void updateHourDisplay() {
		if (Debug.DEBUG) {
			Log.d(TAG, " mCurrentHour: "
					+ mCurrentHour + " mCurrentMinute: " + mCurrentMinute
					);
		}

		mHourPicker.setCurrent(mCurrentHour);

		onTimeChanged();
	}

	private void configurePickerRanges() {
		mHourPicker.setRange(0, 23);
		mMinutePicker.setRange(0, 59);
	}

	private void onTimeChanged() {
		mOnTimeChangedListener.onTimeChanged(this, getCurrentHour(),
				getCurrentMinute());
	}

	/**
	 * Set the state of the spinners appropriate to the current minute.
	 */
	private void updateMinuteDisplay() {
		mMinutePicker.setCurrent(mCurrentMinute);
		mOnTimeChangedListener.onTimeChanged(this, getCurrentHour(),
				getCurrentMinute());
	}
}
